Indie developer Wonderstruck has released the browser-based version of their heist game StrongRoom, which is in development.
StrongRoom is in an early enough build that it consists of abstract shapes to pass for a thief, security devices and loot, represented by cubes, boxes and so on. The developer released a screenshot of what StrongRoom will eventually look like.
The game is basically an a point-and-click puzzle-action title in which the player uses timing and tactics to sneak around and steal loot while evading securty measures.
Players can try out StrongRoom via browser here; Google Chrome is recommended for playing.